User Manual / English
7
6. Automatic Fan Speed Control
Exact CFM requirements vary by application and end-use environment, but 60~80
CFM is typical for the 120mm fan itself. For noise-sensitive applications, it is
recommended that a thermally sensitive fan speed control circuit be used to balance
system-level thermal and acoustic performance. This circuit typically senses the
temperature of an internal heat sink and/or incoming ambient air and adjusts the fan
speed as necessary to keep power supply and system component temperatures
within specifications. Please refer to the fan speed control drawing below.
10
8
6
4
2
0
10%
20%
30%
40%
50%
60%
70%
80%
90%
600
1000
1600
2000
100%
12
Load(%)
400
800
1200
1400
1800
Fan Voltage(V)
Fan Speed
(
R.P.M)
Fan Voltage
Fan Speed
